Children breathe more air per kg of body weight than adults and spend up to 30% of their day in classrooms. Sustained CO₂ above 1500 ppm correlates with reduced concentration and test performance; PM2.5 exposure during developmental years is linked to long-term respiratory and cognitive impact.
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Why classroom air matters
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BB101 and what it requires
Department for Education Building Bulletin 101 (2018) requires daily-mean CO₂ ≤1000 ppm in naturally ventilated teaching spaces and ≤1000 ppm with peaks ≤1500 ppm in mechanically ventilated rooms. Most UK classrooms fail this without active monitoring and ventilation control.
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What works
CO₂ monitoring in every teaching space. The DfE rollout has fitted many — verify yours is wired into the BMS or FM workflow, not just a wall display.
Filtration on mechanical systems. ePM1 50% (MERV 13) minimum for schools near roads.
Roadside infiltration management. Avoid window-only ventilation on the road-facing elevation during peak traffic. PM2.5 guide →